Respuesta :
Answer:
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Explanation:
The chemical composition, spatial distribution, and motions of each population group of stars are related because they reflect the age of the stars and the formation sequence of the disk, bulge, and halo of our Galaxy as material collapsed from a sphere into a rotating disk.
Answer:
Stars form from dust and gas, so galaxies with younger stars typically consist of higher proportions of dust and gas than other galaxies.